Anchoring device



Jan. 23, 1962 M. c. J. LEMOINE .ANCHORING DEVICE Filed April 2, 195s 3,l7,799 Patented Jan. 23 1962 hice 3,017,799 ANCHORING DEVICE Marcel Camille .lean Lemoine, Saverne, France, assigner to Anciens Etablissements Goldenberg &' Cie, Saverne,

France, a corporation ofFrance Filed Apr. 2, 1958, Ser. No. 725,845 Claims priority, application France Apr. 19, 1957 Claims. (Cl. 85-2.4) l

gaged on -t-he lower screw-threaded end 5 of lthe rod 3, permits pulling the traction rod downwardly relative to Ithe shells, this 'traction means bearing against the outer end of the bored hole through the medium of a plate 6 (FIG. l).

The outer face of the shells 1 and 2 are provided with notches or recesses 7 adapted to facilitate their anchorina in the bored hole. The shells also comprise longitudinally extending slits or slots 8 at their lower part for the purpose mentioned hereinafter. i

The shells 1 and 2 are applied against the rod 3` and cams by elastically yieldable connecting means 9 which groups of ramps provided on shells forming, a segmented tube encompassing vthe rod.

These anchoring devices are used for various purposes and particularly for setting objects in Walls, bedding down machines and for any application involving rigidly holding .an object yto material in which it is-possible to make a hole.

These devices are of particular use in4 mines -for the bolting of the rooting, facings and wall. In these various applications, and notably the latter application, very great tensile stresses are produced in the anchoring device 'and it is therefore necessary-if theranchoring device is to remain in posit-ion and perform its function-that the shells should be perfectly hooked or anchored in the material in which they are embedded.

The object of theY present invention is to provide an anchoring device which is an improvement over known anchoring devices in this respect.

The anchoring device of the invention is of the aforementioned type and is characterised in that at least a lrst of the groups of cams and the corresponding group of ramps are so arranged `as to obtain a parallel Separation of the shells in the direction of a diameter ofthe tube constituted bythe shells, and at least a second of said groups of calms and its corresponding group of ramps are so arranged as to ensure a circumferential expansion of the shells which are spl-it in their corresponding part inthe longitudinal direction relative tothe anchoring device.

As a result of these two expansions of different type there is obtained a particularly satisfactory anchoring,J in- A asmuch as the shells are deformed over a crooked or unl even surface which anchors in a very effective manner into 4the wall of the bored hole, the shells exactly conform ing to the shape of this wall;

bear against one of the notches 7 or in recesses provided for this purpose.

In accordance with the invention, theI two groups: of cams A and B and their corresponding groups of ramps formed 'on the shells are arranged in a special manner.

The cams, of the group A are formed .by the opposed lateralfaces lo of a lirs't wedge 11. These lateral faces act on inclined ramps 12 formed at the joints of the shells, that is, on the longitudinally extending edges of the latter.

'In a preferred embodiment, the first group of cams acts.

on ramps formed at the joints of the shells and the seo ond group of cams is located nearer to the traction 'end of the rod and acts on ramps provided on 'the innr'face of the shells.

`Funther features and advantages of the invention will be apparent from the ensuing descriptioh, with reference to the accompanying drawing, to which the invention is in no way limited.

In the drawing:

The cams of group B are formed by the lateral faces 14 of a second'wedge in the form of a truncated pyramid which co-operates with similarly inclined ramps 15 formed 0n 4the inner face of the shells. Two ramps 15 reproY vided on each shell on either side of the longitudinal slit 8 and onpwhich two lateral faces of the truncated pyramid act. This pyramid has truncations :16 and 17 in regions adapted to face respectively the 4slots '8 and the shell Ajoints (FIGS. l and 4).

It is clear therefore that the groiip of cams A and the group of cams B interpenetrate or, in other words, overlap. Thus, the edge 18 of thev wedge 11 penetrates the base ofthe wedge B. This reduces the overall height of the cams `and in consequencetthat of the shells and results in better seating of the cams on the shells, `the surface of Athe letteren-operating with the earns being very great .relative'to the inoperative surface.

The operationof the anchoring'device will now be described with reference to FIGS. 2 to 5.v

FIG. 2 showsthe device at the start A.of anchoring, thatp is, just after it has been inserted in the bored hole T. Owipg to its weight or toy a anual traction exerted thereon, the rod 3 slightly separates the shellsl and 2 ,which ,anchor in .the wall of the hole T'through the medium of their notches 7.

The plate 6 is then placed in position lon the rod 3 and the nut 4 is screwed on the latter.

In the lirst stage, the nut 4 is.y 'screwed on ,the rod to t take up play and bring the plate 6 against the outer end FIG. 1 is an exploded view of lthe elements constituting the anchoring device of the invention; n

FIG. 2 is a longitudinal sectional view of' `the `d evice shown in FIG. l in the position it occupies at the start of anchoring in a bored hole;

FIGS. 3 and 4 are cross-sectionaleviews taken along lines 3-3 and 4 4 of FIG. 2, and

FIG. 5 is a view similar to FIG. 2 of theranchoring device at the end of anchoring.

In :the embodiment shown in the figures, the anchoring device comprises two shells their adjacent relationship a segmented tu'be in which is disposed a tract-ion rod which is provided wi-th two groups of cams A and B 1n different regions.

Traction means, such as a nut 4 screw-threadedly enf I ofV the hole T.. Further.screwing of, the nut causes the rod to, move downwardly relative to the shells and causes the cams t`oact on their corresponding ramps. c

FIG. 3 shows the action of the group of cams A. The faces y10 acting on the ramps .12 tend to ,separate the by 'the arrows f1.

Thus the upper part of the shells undergoes a diametral expansion but the lower part-thereef undergoes, under the effect of the 'cam-faces 14 acting on the inner ramps 1 5- (IFIG. 4), a circumferential expansion permitted by th slots `8, this expansion being in the direction of arrows f2 (FIG. 4). Inother words, there is created at the base of the shells a region` of annular pressure which is lalso affected by the action ofthe upper group of cams A. In this way there is obtained a self-blocking action which improves the anchoring.

The position of the device at the end of anchoring is shown in FIG. 5, the shells 1 andV 2 having undergone maximum expansion and anchoring Ipositively in the wall of the hole T. It will be observed that the groups A and B and their corresponding ramps can be so arranged as to obtain a simultaneous action of the two groups or an action which is staggered at the start of the anchoring. Thus, Ithe group of cams B could be the iirst to act so as to obtain an initial anchoring or hooking of the shells in the wall of the hole T.

Although a' specific embodiment of the invention has been described, many modifications and changes may be made therein without departing from the scope of the invention as defined in the appended claims.

Thus, there could be provided groups of cams other than the groups A and B; in this case the groups A and B could be separated by one or more groups of cams acting in the diametral or circumferential direction. Further, it is not necessary that thegroups of cams A and B should overlap as shown in the gures, although there is thereby obtained an important advantage as concerns the overall length off the device and an improved seating of the ramps on the cams. The traction means provided at the base of the rod 3 could be other than a nut. The group of cams B could be formed by the lateral face of a truncated cone and not a truncated pyramid,

Having now described f ny invention what I claim as new and desire to secure by Letters Patent is:

1. Anchoring device comprising two shells constituting a Ytube segmented along a first axial plane thereof, said,V

shells being provided along the portion thereof facing said -tirst axial plane with a first group-of ramps and being split longitudinally at one of their ends spaced from said first group of ramps, thereby forming slots which extend along a second axial plane of said tube substantially perpendicular to said first axial plane, said shells being provided on their inner face with a second group of ramps dis- Aposedon each side of said slots, said second group of block limiting said four lateral faces are disposed alter- A nately in said rst axial plane and in said second axial plane, 'each of said groups of cams being adapted to face*y its corresponding group of ramps, said parts 'being so constructed and arranged that, upon axial movement of said rod, the cooperation of said first' group of cams with said first group of ramps effectsa separation of saidl shells in 'a direction parallel with said firstl axial plane, and the cooperation of said second group of cams with said second group of ramps causes a bending movement thereof about said neck portion to effect a circumferential expansion of said shells.

2. An anchoring device as claimed in claim 1, wherein said longitudinal edges of said block are truncated.

References Cited in the file of this patent UNITED STATES PATENTS 11,361,836 Dei/1in Dec. 14, 1920 2,028,328 Herold Jan. 2-1, 1936 2,241,343 Fleaca May 6, 1941 FOREIGN PATENTS 356,432 France Nov. 29, s

l 517,082 Belgium Feb, 14, 1953 '754,482 Great-Britain Aug. 8, 1956 

